2022A&A...667A..64H

Query : 2022A&A...667A..64H

2022A&A...667A..64H - Astronomy and Astrophysics, volume 667A64 (2022/11-1)

Brown dwarf companions in microlensing binaries detected during the 2016-2018 seasons.

HAN C., RYU Y.-H., SHIN I.-G., JUNG Y.K., KIM D., HIRAO Y., BOZZA V., ALBROW M.D., ZANG W., UDALSKI A., BOND I.A., CHUNG S.-J., GOULD A., HWANG K.-H., SHVARTZVALD Y., YANG H., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE C.-U., LEE D.-J., YEE J.C., LEE Y., PARK B.-G., POGGE R.W., MROZ P., SZYMANSKI M.K., SKOWRON J., POLESKI R., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M., ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., FUJII H., FUKUI A., ISHITANI SILVA S., KIRIKAWA R., KONDO I., KOSHIMOTO N., MATSUBARA Y., MATSUMOTO S., MIYAZAKI S., MURAKI Y., OKAMURA A., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SUMI T., SUZUKI D., TODA T., TRISTRAM P.J., VANDOROU A., YAMA H. and ITOW Y.

Abstract (from CDS):



em Aims. With the aim of finding microlensing binaries containing brown dwarf (BD) companions, we investigate the microlensing survey data collected during the 2016-2018 seasons.

em Methods. For this purpose, we first modeled lensing events with light curves exhibiting anomaly features that are likely to be produced by binary lenses. We then sorted out BD companion binary-lens events by applying the criterion that the companion-to-primary mass ratio is q ≲ 0.1. With this procedure, we identify six binaries with candidate BD companions: OGLE-2016-BLG-0890L, MOA-2017-BLG-477L, OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, and OGLE-2018-BLG-0360L.

em Results. We estimated the masses of the binary companions by conducting Bayesian analyses using the observables of the individual lensing events. According to the Bayesian estimation of the lens masses, the probabilities for the lens companions of the events OGLE-2016-BLG-0890, OGLE-2017-BLG-0614, OGLE-2018-BLG-1489, and OGLE-2018-BLG-0360 to be in the BD mass regime are very high with PBD > 80%. For MOA-2017-BLG-477 and KMT-2018-BLG-0357, the probabilities are relatively low with PBD = 61% and 69%, respectively.

Abstract Copyright: © C. Han et al. 2022

Journal keyword(s): gravitational lensing: micro - brown dwarfs

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-2017-BLG-0614 Lev 17 26 08.080 -30 17 46.14           ~ 4 0
2 OGLE-2016-BLG-0890 Lev 17 30 25.690 -29 50 48.98           ~ 5 0
3 KMT-2018-BLG-0357 Lev 17 44 12.200 -33 36 23.18           ~ 4 0
4 OGLE-2018-BLG-1489 Lev 17 45 46.600 -23 57 43.85           ~ 4 0
5 OGLE-2018-BLG-0360 Lev 17 52 01.260 -31 08 54.71           ~ 4 0
6 KMT-2017-BLG-1757 Lev 18 05 50.000 -27 04 38.50           ~ 4 0
7 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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